Fig. 5-4. Fitting drive cord

TM 11-6625-3017-14

(5)

Starting from point Y, wind the cord 7 1/2 times

Limiter and discriminator

counter-clockwise round the bush, take it over

pulley B, through the slot in pulley C and attach it to

All thirteen connections are soldered; the complete

the other spring at point Y'.

unit can be removed after these have been unsoldered

by releasing four nuts from the top side of the chassis.

The cover is removable to give access to all the circuits

and presets.

200 kHz and 15 kHz low-pass filters

Either of these units can be removed by unsoldering

two connections and releasing two screws. The 200 kHz

filter is adjustable through holes in the top chassis

(immediately below extension board stowage).

Oscillator drive cord

The oscillator drive cord consists of a 3 1/2 ft length

of nylon cord arranged as shown in Fig. 5-4. Before

fitting, suspend the new cord with a weight of 4 lb (2 kg)

for 24 hours.

To fit a new cord:

(1)

Turn the

OSCILLATOR

TUNE

control

fully

clockwise.

(2)

Attach one end of the cord (X) to the correct spring

on pulley C.

Fig. 5-4. Fitting drive cord

(3)

Pass the cord through the slot and once clockwise

5.6

REPLACEMENT OF COMPONENTS

round pulley C, then over pulley A and counter-

clockwise for three-quarters of a turn round the

Fuses

bush to point X'.

The two fuses are fitted in fuseholders in the rear

(4)

Ease the pin in the bush clear of the hole by means

panel. FS2 must never be changed without first switching

of a small screwdriver. Loop the cord into the hole

off the main supply, or circuit damage may result.

and push back the pin to anchor it.

Transistors

Transistors that are mounted in holders may need

to be selected for low noise if replaced.

5-9